Electromechanical transmission device.



No. 833,051. PATENTE!) G0319, 1906. A. W. HARRISON.

ELECTROMBCHANIGAL TRANSMISSION DEVICE APPLIUATION FILED .TUNE12. 1905.

8 SHEETS-SHEET 52X/@Wagga Nm 3,533,051 PTENTED DGT. 9, X905. A. W.HARRISON. ELEGTE" MEG'I `{IIC-AL TRASMSSIGN DEVICE.

Hummm FILED JUNE 12. 1905.

3 SEElS-SHEET 3 ARTHUR W. HARRISON ,i OF LOS ANGELES, CALIFORNIA.

ELECTROMECHANICAI. TRANSMISSION Specification of Letters Patent.

DEVICE.

Patented oct. 9, 190e.

Application filed June 12,1905. Serial No. 264,955.

To rI/EZ whom it may concern:

Be it known that I, ARTHUR W. HARRISON,

a citizen ofthe United States, residing at Los Angeles, in the county ofLos Angeles and 'State of California, have invented ne'w and usefulImprovements in Electromechanical Transmission Devices,` of which thefollowing is va specification.

My invention relates to an electromechanical mechanism for controllingthe transmission of electrical energy when applied to drivin automobilesand other like mechanisms and the object thereof is to produce 'amechanism which is capable of being run at any desired speed. I accomlish this ob'ect -by the mechanism described herein and. illustratedt inthe accompanying drawings, in which my invention is illustrated as aplied to mechanism for driving an automo ne in which a polyphasealternating-current system is used.

Figure 1 is a lon 'tudinal central section of the electrical mec anism.Fig. 2 is a dia.- grammatic representation of the ciicits andconnections. Fig. 3 is a -gure showing con- 1 ventionally the primemover and other parts,

some being in section, some in elevation, and

some diagrammatically.

' In the drawin s the field-magnet 5 of the generator is rigid y securedupon theshaft 6, which is driven by a hydrocarbon or other engine 6,which is shown diagrammatically on Fig. 3. Upon this shaft is rigidlysecured the field ortion 7 of a magnetic clutch. This field is shown asformed in yoke 8 ofthe rotary field-magnet of the, generator. This yokeis rigidly secured upon shaft 6. Field 7, if desired, may be madeseparate from the yoke; but I prefer to use the yoke on account ofcompactness. The armature 9 of the magnetic clutch is slidably securedupon shaft 10 b a key 11. This armature is normally hel out ofengagement with its field 7 py springs 12, mounted on bolts 13, which,volts are secured to one of the compressionp lates 14 of the rotor ofthe induction-motor. This rotor is secured upon shaft 10 by key 11,which passes through a keyway in the compression-plates 14 and V15. Therotor is preferably provided with a high-resistance squirrel-cagewinding 16 to give a high starting torque and a low-resistance suirrel-cage winding 17 to bring the rotor near y into synchronism withthe field-magnet of the generator. The stator of the induction-motor isprovided with special connection (shown in Fig. 2) by which the numberci pores may be changed and the s eed of the rotor varied,

A controller 18, aving one or more sets of contacts, (shown as havingtwo sets,) is provided to change the circuits in the statorwinding ofthe induction-motor`. When contacts 19, Fig. 2, engagecontroller-fingers 21 22 and 24 25 and 27 28, the stator-winding isconnected up so as to form the largest num-l ber of poles, giving-therotor its minimum speed. When the controller is changed so t at contacts29 engage controller-fingers 2() 21 and 23 24 and 26 27, thestator-winding isr connected up so as to form the smallest number ofpoles, thereby giving the rotor its maximum speed. A rheostat 30 isprovided with two sets of contacts 31 and 32, crosscoiinected to one setof resistance and in series with they otary field-magnet of thegenerator., ig.l 3 the stationarycontacts are shown diagrammatically asa single set,v

and the controller-arm 1s a movable drum with two setsof contacts, eachset engaging the stationary contacts at different times to vary thestrength of the magnetic field. When the controller-contacts are onlowspeed connections, rheostat-contacts 32 will be in use. Beforestarting, the controllerarm 33 willrbe off the contacts and lie betweencontacts 32 and 31. When starting, 'controller-arm 33 will first engagecontact 32, which gives the greatest resistance, and as the arin ismoved farther on it successively engages contacts 32 and 32', givingless resistance, and when it reaches contact 32 all resistanceiscut out.When changing the controller-contacts t`o high-speed connections, therheostat arm is disengaged from all contacts to prevent sparking atcontroller-contacts and then lies between contacts 32 and 31. It is thenbrought in engagement with contact 31', which gives the greatestresistance, and as the arm is moved farther on it successively engagescontacts 31",- 31'7 and 31, when all resistance is cut out. At this timethe rheostat-arm also engages contact 34, which contact is connected tocontact. 35 of relay 36, affich relay is connected across thegenerator-mains 37 and 38.

When the magnet is inert, the armature 39 of this rela. is held out ofengagement with contact 35 y spring 40. When the voltage of thegenerator reaches a predetermined value, the magnet is energized anddraws its armature to engage contact 35. Relay 4'1 is connected inseries with the motor-circuit, and

lroo

IIO

when a lar e current is flowing in the circuit the magne draws itsarmature li2-irom engagemnt with contact 43.' When the current fallsv toa predetermined value, the

power of l(sipring 44 overcomes that of the magnet an draws the armatureinto engagement with contact 43 and when the contacts 34 and 35 areengaged energizes the clutch- 'magnet, which draws its armature intoengagement therewith and locks shafts 6 and 10 together. The rotatingfield of the generator and .the rotor of the motor are then insynchronism. When the tractionis increased, as in climbing a hill, thevoltage Will fall. As soon as the voltage has fallen so low that relay36 has not sulicient power to hold its armature againstl the powerA ofspring 40 the armatu're se arates from contact 35, thereby breaking t ecircuit through the clutch-coils, and its members separate,

and the rotor of the motor and held-magnotI of the generator are vthenuncoupled. Thereafter the automobile will run as anelectrically-operated machine until the clutch-coils are againenergized, as before explained. As vthe generator and motor' are onlyused at starting and on slow speeds, they may be mains caused made withmuc-h less capacity than the engine. A direct-current generator 45 isprovided to excite the eld-magnet and clutch, it is provided withslip-rings 46, so that it maybe runas a synchronousmotor from thepolyhase' mains to which it is connected, the

1 eld of exciter being overexcited for the purpose of lraisin the lowpower factorI in the by using the induction-motor. Rheostat 47 isconnected in the field-'circuit and is operated by foot-lever 48, whichalso operates' the throttle l50ct the engine at the saine time.Direction-switch 5l. is composed ofthe stationar contacts 54, 55, 55,and 57, and the movab e drum-contacts 58, 59, and 60, and the clutchstationary contacts 6i and 62,.and the movable drum-contact 63. Whenmovable drum-'contacts 58 engage the stationery' contacts 54 to 57 andthe clutch stationary contacts 6l and 62 are engaged by the movablecontacts 63, .the contacts are in position to permit the vehicle to bemoved for Ward when the power is applied. When the switch` is operatedto bring contacts 59 into engagement with contacts 57 and 54 and contact60 into engagement with contacts 55 and 56, the contacts are in positionto permit the vehicleto bemoved backward when the power is applied'.switch the clutch stationary contacts are not engaged, and hence theclutch-coils are not energized, thereby providing what i termenelectrical stop. i

Having Idescribed my invention, what I claim asnew, and desire to secureby Letters Patent, is-

i. In an electromechanical transmission On this position oi the'4 devicethe 4,combination of a motor and. a generator mounted on independentshafts; a magnetic clutch havin its coils carried by the generator-shaftan its armature carried by the motor-shaft; a relay whose coils areconnected in series with the motor, said relay having en armatureadapted to form a part oi' the clutch-circuit; a spring connected tosaid armature to close the clutch-circuit when the current is decreasedto a predetermined value.

2. ln an electromechanical transmission device the combination oi amotor and a generator mounted uponindependent shafts; a magnetic clutchhaving one member carried by the generator-shaft and the othermembercarried by the motor-shaft and a relay having its coils connected acrossthe generatormains and .having an armature adapted to close theclutch-circuit when said relay-coils are energized to a predeterminedstrength.

3. In an 'electromechanical transmission ydevice the combination of amotor and a generator mounted upon independent shafts; a magnetic clutchhaving one member carried by one of said shafts and the other membercarried by the other shaft, and a direct-current generator adapted to'excite the fieldmagnet coils and clutch-coils.

4. In an electromechanical transmission device the combination of amotor and a generator mounted on independent shafts; means to increaseor decrease the excitation. of the generator-field., said meanscomprising a rheost-at in series with the said iield; and means tooperate the rheostat and means to change the number ci motorstator-poles.

5. in an electro-mechanical transmission device the ccinbinationof amotor and a generator mounted upon independent shafts; a magnetic clutchhaying one member carried by one of said shafts 'and the other membercarried by the other oi said shafts; an excitergenerator adapted toenergizeA the clutchcoils.y I h 6. In an electromechanical transmissiondevice the combination of a motor and generator. 'mounted yonindependent shafts; a motor-controller; a rheostat in series with thegenerator-held adapted to increaseor decrease the excitation ofrthegeneraton" d when theh motor-controller is operated, .l controller andrheostat being mounted a common shaft; means to operate the con--trollcr; and means to change the number et motor stator-poles.l y

7. In electromechanical transmission IOO device the combination of amotor andI generator mounted upon independent shafts; a rheostat inseries with the generator-field; and means adapted to openthegonerator-iield circuit when the motor-controller fingers arechanging to different operative positions.

' 8. .ln an electromechanical transmission device the combination oi almotor and a gen- Igo "erator mounted upon independent shaftsg'ii vInWitness that I c-iiiim the foregoing I magnetic clutch having one membercmried have heren@ to Subscribed my name this 16th by thegenerator-shaft sind the other part cnrl d ay of May, 1905,

,Tied by the motorshafi.; means far enegizl ARTHUR W'. HARRISON.

5v ing the coils of the Ciuth; and, means to mex Witnesses.'

chsmically short--circuib contacts :in th clutch? i G. E. HARPHAM,energizing circuit. filmm T. HAZARD.

